Perhaps you should try some spelling variations:
van quang » van quan, tran quang, van tuan
cua triet » cua viet, su triet, va triet
van nang » van ban, van dong, van dung
nam thuc » nam thuoc, am thuc, nam thu
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
va nam » van nam, ha nam, va nay
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((van nang) OR (van quang)) xa hoi. hieu va nam thuc dan hanh vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((van nang) OR (van quang)) xa hoi. hieu va nam thuc dan hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: so sach ((van nang) OR (van quang)) xa hoi. hieu va nam thuc dan hanh vi cua triet*.